scholarly journals Age-Dependent Discrimination between Stereoisomers of 1-Amino-2-Ethylcyclopropane-1-Carboxylic Acid in Carnation Petals

1986 ◽  
Vol 80 (4) ◽  
pp. 1045-1047 ◽  
Author(s):  
Zach Adam ◽  
Shimon Mayak
Keyword(s):  
Carboxylic Acid ◽  
Age Dependent ◽  
Carnation Petals

scholarly journals Effects of Aging on Hair Color, Melanosome Morphology, and Melanin Composition in Japanese Females

2019 ◽  
Vol 20 (15) ◽  
pp. 3739 ◽  
Author(s):  
Takashi Itou ◽  
Shosuke Ito ◽  
Kazumasa Wakamatsu
Keyword(s):  
Carboxylic Acid ◽  
Aspect Ratio ◽  
Negative Correlation ◽  
Significant Positive Correlation ◽  
Significant Negative Correlation ◽  
Hair Color ◽  
Age Dependent ◽  
Japanese Female ◽  
Effects Of Aging ◽  
Absorbance Spectra

In a previous study, we showed that the size of melanosomes isolated from Japanese female hairs enlarges with age, and this affects the hair color. In this study, we analyzed the age-dependent changes in hair melanin in order to further explore the factors related to hair color changing by aging. A significant positive correlation with age was found in the total melanin amount (TM) and the mol% of 5,6-dihydroxyindole (DHI) units, while no correlation was found in pheomelanin mol%. TM showed significant correlations with hair color parameters and the melanosome volume, suggesting that hair color darkening by aging is caused by the increase in TM due to the enlargement of the size of melanosome. From the measurement of absorbance spectra on synthetic eumelanins with different ratios of DHI and 5,6-dihydroxyindole-2-carboxylic acid (DHICA), we found that the increase in DHI mol% also contributes to the darkening of hair color by aging. In addition, the level of pyrrole-2,3-dicarboxylic acid (PDCA), a marker of DHI melanin, showed a significant negative correlation with the aspect ratio of melanosome, suggesting a contribution of DHI melanin to the change in melanosome morphology by aging.

The site of 1-aminocyclopropane-1-carboxylic acid synthesis in senescing carnation petals

1985 ◽  
Vol 65 (2) ◽  
pp. 196-202 ◽  
Author(s):  
Yoram Mor ◽  
Abraham H. Halevy ◽  
Hanna Spiegelstein ◽  
Shimon Mayak
Keyword(s):  
Carboxylic Acid ◽  
Acid Synthesis ◽  
Carnation Petals

scholarly journals 346 PRECURSORS OF SYSTEM II ETHYLENE SYNTHESIS IN SENESCING CARNATION PETALS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 480c-480
Author(s):  
Pablo Gonzalez ◽  
Richard J. Gladon
Keyword(s):  
Carboxylic Acid ◽  
Glutamic Acid ◽  
Aminolevulinic Acid ◽  
Deionized Water ◽  
The Other ◽  
Ethylene Synthesis ◽  
Basal Portion ◽  
Carnation Petals

Methionine (MET) is considered the first committed precursor of ethylene (C2H4), and the pathway has been established as MET → S-adenosylmethionine (SAM) → 1-aminocyclopropane-1-carboxylic acid (ACC) → C2H4. It has been suggested that another pathway to C2H4 may exist, and this pathway has been labeled System II. Our objective was to evaluate several compounds as possible precursors of System II C2H4 production. `White Sim' carnations were placed continuously in 20 mM solutions of MET, ACC, δ-aminolevulinic acid, glutamic acid, α-ketoglutarate, or homocysteine. Deionized water was the control. C2H4 production from the entire flower was measured, and ACC in the basal portion of the petals was quantified. Flowers treated with ACC exhibited the greatest C2H4 production and accumulation of ACC. Homocysteine caused greater production of C2H4 and accumulated more ACC than MET and the other possible precursors. These results suggest that homocysteine may be involved in System II C2H4 production in senescing carnation petals.

Effects of Hyperoxia on Lung Utrastructure

1970 ◽  
Vol 28 ◽  
pp. 26-27
Author(s):  
Gladys Harrison
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Light Microscopy ◽  
Oxygen Effects ◽  
Age Dependent ◽  
The Central Nervous System ◽  
The Subject ◽  
Space Age ◽  
Alveolar Septa ◽  
Extensive Damage

With the advent of the space age and the need to determine the requirements for a space cabin atmosphere, oxygen effects came into increased importance, even though these effects have been the subject of continuous research for many years. In fact, Priestly initiated oxygen research when in 1775 he published his results of isolating oxygen and described the effects of breathing it on himself and two mice, the only creatures to have had the “privilege” of breathing this “pure air”.Early studies had demonstrated the central nervous system effects at pressures above one atmosphere. Light microscopy revealed extensive damage to the lungs at one atmosphere. These changes which included perivascular and peribronchial edema, focal hemorrhage, rupture of the alveolar septa, and widespread edema, resulted in death of the animal in less than one week. The severity of the symptoms differed between species and was age dependent, with young animals being more resistant.

1248: Impact of Surgical Treatment of Renal Carcinoma on Renal Function and Blood Pressure: A Race- and Age-Dependent Association

2007 ◽  
Vol 177 (4S) ◽  
pp. 411-412
Author(s):  
Javier Miller ◽  
Angela Smith ◽  
Kris Gunn ◽  
Erik Kouba ◽  
Eric M. Wallen ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Renal Function ◽  
Surgical Treatment ◽  
Renal Carcinoma ◽  
Age Dependent
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